用同一KMnO4标准溶液分别滴定等体积的FeSO4和H2C2O4溶液，消耗等体积的标

苏子降气汤主治证的病机是（）；肾阳不足。

与磨光的效率有关的因素是

A．转速与压力

B．磨具的硬度

C．均有关

D．磨具的粒度

E．磨具的形状

慢性肾衰竭时，提示预后不良的是

A．颗粒管型

B．细胞管型

C．透明管型

D．肾衰竭管型

E．脂肪管型

在容器中充入SO₂和只由¹⁸O原子组成的氧气¹⁸O ₂，在一定条件下反应：

2SO₂(g) ＋O ₂(g) 2SO₃(g)，达到平衡时， ¹⁸O存在于（    ）

A．只存在于O ₂中

B．只存在于O ₂和SO₃中

C．只存在于SO₂和SO₃中

D．SO₃、SO₂和O ₂中都有可能存在

"This is a really exciting time—a new era is starting," says Peter Bazalgette, the chief creative officer of Endemol, the television company behind "Big Brother" and other popular shows. He is referring to the upsurge of interest in mobile television, a nascent industry at the intersection of telecoms and media which offers new opportunities to device-makers, content producers and mobile- network operators. And he is far from alone in his enthusiasm.

Already, many mobile operators offer a selection of television channels or individual shows, which are " streamed" across their third-generation (3G) networks. In South Korea, television is also sent to mobile phones via satellite and terrestrial broadcast networks, which is far more efficient than sending video across mobile networks; similar broadcasts will begin in Japan in April. In Europe, the Italian arm of 3, a mobile operator, recently acquired Canale 7, a television channel, with a view to launching mobile-TV broadcasts in Italy in the second half of 2006. Similar mobile-TV networks will also be built in Finland and America, and are being tested in many other countries.

Meanwhile, Apple Computer, which launched a video-capable version of its iPod portable music-player in October, is striking deals with television networks to expand the range of shows that can be purchased for viewing on the device, including "Lost", "Desperate Housewives" and "Law & Order". TiVo, maker of the pioneering personal video recorder (PVR), says it plans to enable subscribers to download recorded shows on to iPods and other portable devices for viewing on the move. And mobile TV was one of the big trends at the world’s largest technology fair, the Consumer Electronics Show, which took place in Las Vegas this week.

Despite all this activity, however, the prospects for mobile TV are unclear. For a start, nobody really knows if consumers will pay for it, though surveys suggest they like the idea. Informa, a consultancy, says there will be 125 million mobile-TV users by 2010. But many other mobile technologies inspired high hopes and then failed to live up to expectations. And even if people do want TV on the move, there is further uncertainty in three areas: technology, business models and the content itself.

According to the text, substantial work in mobile-TV networks has been conducted in（）

A. an oriental nation

B. USA

C. an European nation

D. Japan